We have seen portable power-banks and portable wireless speakers, but this first-of-its-kind charging case combines both to offer a 2500mAh battery and an hi-definition WiFi/Bluetooth speakers with multi-cast functionality neatly combined as an iPhone case.

Crowdfunded PERI Duo aims to solve two needs of mobile-phone users with a single product, more battery power and hi-quality wireless amplified sound. With an integrated hi-def DAC (digital-to-analog converter) and fully programmable single-chip DSP, the PERI Duo offers true EQ (equalization) settings through the embedded DSP firmware using the PERI Audio App. The versatile case not only provides 2500mAh additional power to your phone but also detaches to become an independent wireless speaker which can be used with Apple AirPlay or from any Bluetooth enabled Android phone. Another exciting feature is the Multicast feature, which allows you to stream your music to dozens of Duo cases more than 100 feet away simultaneously through peer-to-peer Wi-Fi without the need for a local network - imagine a multi-floor dorm or Beach party where you can be the DJ and stream your music to anyone who has a PERI Duo.

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